Apple Mac 5260/100 - Manual (Page 194)

5260 and 5280 Adjustments Geometry - 11
Horizontal Size
1 Run Display Service
Utility to display the
All-White Screen Test
Pattern.
2 Using a flat-blade
plastic tool, adjust the
Horizontal Size 2 control
(R440) until the raster
width is 9.5 inches
(± 1/8 inch) or
240 mm (± 2 mm)
Horizontal Size 2 Control
(R440)
Run
Display Service
Utility
All-White
Screen Pattern